Re: New file uploaded to

When you and Tony were discussing the inputs to U1275 it reminded me of the Tek Made parts book and later the Tek Xref book.


On 4/27/2018 5:23 AM, JJ wrote:
Bob, thanks for the 155-0067-02 spec sheet and the Xref resources. They're
very informative. Wish I had them 3 weeks ago!


On Fri, Apr 27, 2018 at 1:06 AM, Robert Hay <bobh@...> wrote:

Look in the Tek Cross Reference book page 12-9 has some info on the
152-0502-00 and lesser information on the 152-0397-00. The text is
searchable. It may give you a generic replacement.

I thought the information on U1275 might help understand what it does in
the circuit. TekWiki has several other valuable references on the same


On 4/26/2018 6:48 PM, Yiu On Tony C via Groups.Io wrote:

Hi Robert :
It is a very useful information for me to understand the PSU of 7904 !
On the other hand , I am looking for the data sheets for the fast
recovery rectifier 152-0502-00 ( MBD5300 ) and 152-0397-00 ( MR880 ). It
was because my PSU of 7904 CR1311 and 1312 using replacements having
different shut down result at same loading conditions, it is low loading
only !
Thanks !
RegardTony CheungAPR 27 2018

From: " Notification" <>
To: "" <>
Sent: Friday, April 27, 2018 4:12 AM
Subject: [TekScopes] New file uploaded to
Hello,This email message is a notification to let you know that a
file has been uploaded to the Files area of the
group.File: 7904 - U1275 IC Information 155-0067-02.pdfUploaded By:Robert
Hay Description:
Internals info for U1275 in 7904 mainframe, PS control chip 155-0067-02
from the Tek Made handbook.You can access this file at the URL:
The Team

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